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YOUR RESEARCHAnother water tank cap question
Leading reported evidence
Install brand new porsche 04(blue) cap
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Performed · outcome unconfirmed · Original poster
Installed a brand new Porsche 04(blue) cap from PP due to reading of cap failures.
Leading evidence: 'Install brand new porsche 04(blue) cap' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install brand new porsche 04(blue) cap' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
Water tank was installed last fall due to the dreaded seam leak.
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Performed · outcome unconfirmed
The cap is not really intended to be removed and replaced like the old metal caps of well, old.
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Performed · outcome unconfirmed
I'm having the same problem, replaced tank with one from PP not OE in September with the black cap.
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Performed · outcome unconfirmed · Original poster
Today with the "old" black cap reinstalled and tightened until it "bottomed out" drove until up to temp.
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9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T161109Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
"Unstored" my 2005 996 C4S today. Installed a brand new Porsche 04(blue) cap from PP due to reading of cap failures. Water tank was installed last fall due to the dreaded seam leak. Cap removed was one of the Blau(black) versions and had been functioning fine to my knowledge. While installing the new cap I noticed it was turning harder than normal. I thought cross-thread! Pulled off, nope. Reinstalled and tightened down(read tight!). Drove the car for 10-15 minutes, up to temperature and all gauges looked good. Pulled into garage, shut off, and noticed anti-freeze smell. Found puddle by left rear. Opened hood noticed water in catch area beneath new cap. Level dropped less than 1/8"(only in my driveway, not street). Let cool, removed, noticed cap gasket wet about 1/3 around as if passing water. Put old cap back on. Noticed the blue cap has the same internal part as the black cap which is made by Blau. Did I do something wrong or just didn't "strong-arm" new cap enough?
You may have over filled the tank and the coolant expanded as it heated and found it's way out via the lift valve. That's normal. Expanding water has to find an escape route. If the lift valve does not lift and the cap is tight, then the plastic reservoir can split. Always good policy never to over fill. Safer to keep the cold level on the lowest mark. The level will rise to the high mark as it heats up. IMHO.
Thanks. The deal is I only changed to the new cap. Have not added cooling fluid since I had it flushed last year after tank changed. Have had no overflows since that time. I'm thinking didn't have new cap fully tightened??
To the inexperienced the cap can take more force to properly tighten than one might believe is required.
I get fooled almost every time I take the cap off. I don't take the cap off but very very infrequently. Every time when I go to put it back on I have to really give it a twist to make sure it is properly tightened down. Then I twist it even harder and it turns some more.
Also one has to be very careful to not cross thread the cap. I really try to avoid removing the cap unless I absolutely have to. Thank goodness one can check the coolant level by looking through the tank wall rather than opening the cap. The cap is not really intended to be removed and replaced like the old metal caps of well, old.
I'm having the same problem, replaced tank with one from PP not OE in September with the black cap. A few months later started leaking again thought it was leaking from the black cap so I just replaced it with the blue one topped it off only lasted a couple of days before it started leaking again.
Today with the "old" black cap reinstalled and tightened until it "bottomed out" drove until up to temp. No leaks! Must be getting weak in my old age! Thanks Macster.
Update: Finally got tired of smelling antifreeze after driving although no visible leaks. Finally reinstalled the blue cap as recommended and tightened down per Macster's advice(read tight!). Have driven car numerous times with no smell after parked. You guys were right! Thanks.
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